Sinfonia Technology Co., Ltd.

Takahashi, Hisashi

Yamamoto, Kenji

Kazunari Kanazawa

Hiroshi Ikeda

Yuji Ogawa

Takeshi Tomizaki

Yuki Ito

Makoto Maruyama

Nobumasa Usiro

Hisashi Takahashi

Kenji Yamamoto

A motor control apparatus includes: a motor drive control section that controls driving of a motor using a predetermined phase; a rotation position detecting section that, at every 180 degrees of an electrical angle of the motor, outputs two kinds of detection signals according to the rotation position of the rotor of the motor; a stopped position estimating section that estimates the stopped position at the start of rotation of the rotor using an elapsed time from when rotation the rotor starts until the kind of the detection signal outputted from the rotation position detecting section switches; a rotational speed estimating section that estimates the rotational speed of the rotor using the elapsed time and the stopped position; and an estimated phase calculating section that calculates an estimated phase as the aforementioned predetermined phase using the rotational speed.

Motor control apparatus and motor control method

A motor control apparatusincludes a fixed phase setting section that sets a fixed phase of a motor according to a detection signal. At the start of rotation of a rotor, the fixed phase setting section sets a first fixed phase that is equal to or greater than &#x2212;90 degrees relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees relative to a stable stopping point at a minimum electrical angle of the rotor as the fixed phase, and sets a second fixed phase that is equal to or greater than &#x2212;90 degrees relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees relative to a stable stopping point at a minimum electrical angle of the rotor.

Growing community of inventors

Tokyo, Japan

Kazunari Kanazawa